Claims
- 1. A vapor grown fine carbon fiber comprising a hollow space along the fiber in its interior, and having a multi-layer structure, an outer diameter of 2 to 500 nm, and an aspect ratio of 10 to 15,000, wherein the fiber comprises a center portion and a peripheral portion, and wherein the center portion has a carbon structure comprised of carbon sheets aligned differently from carbon sheets that form the structure of the peripheral portion.
- 2. A vapor grown fine carbon fiber comprising a hollow space along the fiber in its interior, and having a multi-layer structure, an outer diameter of 2 to 500 nm, and an aspect ratio of 10 to 15,000, wherein the fiber comprises a center portion and a peripheral portion, and wherein the center portion has a carbon structure different from that of the peripheral portion, and wherein the hollow space of the fiber has a diameter (d0) and the fiber has an outer diameter (d) satisfying the following relation: 0.1d≦d0≦0.8d.
- 3. A vapor grown fine carbon fiber comprising a hollow space along the fiber in its interior, and having a multi-layer structure, an outer diameter of 2 to 500 nm, and an aspect ratio of 10 to 15,000, wherein the fiber comprises a center portion and a peripheral portion, and wherein the center portion has a carbon structure different from that of the peripheral portion and wherein the center portion of the fiber has a diameter (d1), the hollow space of the fiber has a diameter (d0) and the fiber has an outer diameter (d) satisfying the following relations: 1.1d0≦d1 and d1≦0.9d.
- 4. A vapor grown fine carbon fiber comprising a hollow space along the fiber in its interior, and having a multi-layer structure, an outer diameter of 2 to 500 nm, and an aspect ratio of 10 to 15,000, wherein the fiber comprises a center portion and a peripheral portion, and wherein the center portion has a carbon structure different from that of the peripheral portion and wherein the center portion of the fiber contains a herringbone-shaped carbon structure, and the peripheral portion of the fiber contains a concentric ring carbon structure.
- 5. The fine carbon fiber according to claim 1, wherein the hollow space is partially closed.
- 6. The fine carbon fiber obtained through heat treatment of a fine carbon fiber as recited in claim 1 at about 2,000 to about 3,500 C.
- 7. The fine carbon fiber according to claim 1, further comprising boron or a boron compound.
- 8. The fine carbon fiber according to claim 7, wherein boron (B) is contained, in an amount of about 0.01 to about 5 mass %, in carbon crystals constituting the carbon fiber.
- 9. A fine carbon fiber mixture comprising a fine carbon fiber as recited in claim 1 in an amount of about 5 to about 80 vol. % on the basis of the entire carbon fiber mixture.
- 10. A fine carbon fiber composition comprising a fine carbon fiber according to claim 1.
- 11. A gas occlusion material comprising a fine carbon fiber composition according to claim 10.
- 12. A secondary battery comprising an electrode material, wherein the electrode material is a fine carbon fiber composition according to claim 10.
- 13. The fine carbon fiber according to claim 1, wherein the center portion of the fiber contains a carbon structure in which carbon sheets are aligned substantially perpendicular to the axis of the fiber.
- 14. A vapor grown fine carbon fiber comprising a hollow space along the fiber in its interior, and having a multi-layer structure, an outer diameter of 2 to 500 nm, and an aspect ratio of 10 to 15,000, wherein the fiber comprises a center portion and a peripheral portion, wherein the center portion has a carbon structure different from that of the peripheral portion, and wherein the hollow space is partially closed at at least one point which is between the ends of the carbon fiber.
Priority Claims (1)
Number |
Date |
Country |
Kind |
P2001-264052 |
Aug 2001 |
JP |
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CROSS REFERENCE TO RELATED APPLICATIONS
This application is an application filed under 35 U.S.C. §111(a) claiming benefit pursuant to 35 U.S.C. §119(e)(1) of the filing date of Provisional Application No. 60/316,985 filed Sep. 5, 2001 pursuant to 35 U.S.C. §111(b).
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Provisional Applications (1)
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Number |
Date |
Country |
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60/316985 |
Sep 2001 |
US |